Chemical pressure-reducing injection-increasing agent for injection well and preparation and use thereof

Abstract

The invention relates to a chemical pressure-reducing injection-increasing agent for an injection well and preparation and use thereof. The chemical pressure-reducing injection-increasing agent comprises the following components in percentage by weight: 0.03 to 0.3 percent of hexadecyl trimethyl ammonium bromide surfactant, 0.05 to 0.5 percent of MY / IMC-80BHH corrosion inhibitor, 0.1 to 0.3 percent of polyamino polyether methylene phosphonae, 0.01 to 0.03 percent of polyquaternium, 0.05 to 0.1 percent of citric acid, 0.1 to 0.5 percent of hydrochloric acid and the balance of water. The total amount of the injected water is 100 percent. The pressure-reducing injection-increasing agent is used in an amount which is 0.1 to 0.3 percent based on the weight of injected water. The pressure-reducing injection-increasing agent is added into a medicine adding device in a water injection station, uniformly mixed, pumped into a high-pressure pipe by a high-pressure pump and is injected into stratum with injected water to achieve a chemical pressure-reducing injection-increasing effect. The single-well pressure drop is about 15 percent.

Description

technical field [0001] The invention relates to a chemical pressure-reducing and injection-increasing agent for water injection wells in oilfields and its preparation and application. Background technique [0002] During the development of the oilfield, the quality of the injected water is poor, with many suspended particles, and there are sulfate-reducing bacteria (SRB), iron bacteria, saprophytic bacteria, etc. After this type of oilfield is put into development, due to the incompatibility of the injected water and the formation water, precipitation occurs At the same time, it will aggravate the corrosion of the system, provide a place for bacteria to grow and reproduce, bring about corrosion and clogging problems, cause the water injection pressure to rise, the water injection efficiency will decrease rapidly, and the normal injection will not be performed, which will reduce the oil production rate of the oil field and become a constraint to the long-term stable production...

AI Technical Summary

Problems solved by technology

[0002] During the development of the oilfield, the quality of the injected water is poor, with many suspended particles, and there are sulfate-reducing bacteria (SRB), iron bacteria, saprophytic bacteria, etc. After this type of oilfield is put into development, due to the incompatibility of the injected water and the formation water, precipitation occurs At the same time, it will aggravate the corrosion of the system, provide a place for bacteria to grow and reproduce, bring about corrosion and clogging problems, cause the water injection pressure to rise, the water injection efficiency will decrease rapidly, and the normal injection will not be performed, which will reduce the oil production rate of the oil field and become a constraint to the long-term stable production of the oil field. a major problem with

[0003] In view of the above situation, it is necessary to study a chemical pressure-reducing and increasing injection agent for water injection wells to solve the problem of formation clogging caused by incompatibility between injected water and formation water, water injection pressure rises, normal injection cannot be injected, and the oil recovery rate of oilfields is reduced.

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